/*
 * Copyright 2006-2018 The MZmine 2 Development Team
 * 
 * This file is part of MZmine 2.
 * 
 * MZmine 2 is free software; you can redistribute it and/or modify it under the terms of the GNU
 * General Public License as published by the Free Software Foundation; either version 2 of the
 * License, or (at your option) any later version.
 * 
 * MZmine 2 is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without
 * even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
 * General Public License for more details.
 * 
 * You should have received a copy of the GNU General Public License along with MZmine 2; if not,
 * write to the Free Software Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301
 * USA
 */

package net.sf.mzmine.util;

import java.util.zip.DataFormatException;
import java.util.zip.Inflater;

/**
 * Compression related utilities
 */
public class CompressionUtils {

  /**
   * Decompress the zlib-compressed bytes and return an array of decompressed bytes
   * 
   */
  public static byte[] decompress(byte compressedBytes[]) throws DataFormatException {

    Inflater decompresser = new Inflater();

    decompresser.setInput(compressedBytes);

    byte[] resultBuffer = new byte[compressedBytes.length * 2];
    byte[] resultTotal = new byte[0];

    int resultLength = decompresser.inflate(resultBuffer);

    while (resultLength > 0) {
      byte previousResult[] = resultTotal;
      resultTotal = new byte[resultTotal.length + resultLength];
      System.arraycopy(previousResult, 0, resultTotal, 0, previousResult.length);
      System.arraycopy(resultBuffer, 0, resultTotal, previousResult.length, resultLength);
      resultLength = decompresser.inflate(resultBuffer);
    }

    decompresser.end();

    return resultTotal;
  }

}
